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ch347_spi: Add initial support for the WCH CH347

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Add support for the WCH CH347, a high-speed USB to bus converter
supporting multiple protocols interfaces including SPI. Currently only
mode 1 (vendor defined communication interface) is supported, mode 2
(USB HID communication interface) support will be added later. The code
is currently hard coded to use CS1 and a SPI clock of 15 MHz, though
there are 2 CS lines and 6 other GPIO lines available, as well as a
configurable clock divisor for up to 60MHz operation. Support for these
will be exposed through programmer parameters in later commits.

This currently uses the synchronous libusb API. Performance seems to be
alright so far, if it becomes an issue I may switch to the asynchronous
API.

Tested with a MX25L1606E flash chip

Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
Change-Id: I31b86c41076cc45d4a416a73fa1131350fb745ba
Reviewed-on: https://review.coreboot.org/c/flashrom/+/70573
Reviewed-by: Thomas Heijligen <src@posteo.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Nicholas Chin
2022-10-23 13:10:31 -06:00
committed by Thomas Heijligen
parent 83b051a9b4
commit 0facf12ca4
9 changed files with 385 additions and 9 deletions
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include/programmer.h
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@ -61,6 +61,7 @@ extern const struct programmer_entry programmer_atapromise;
extern const struct programmer_entry programmer_atavia;
extern const struct programmer_entry programmer_buspirate_spi;
extern const struct programmer_entry programmer_ch341a_spi;
extern const struct programmer_entry programmer_ch347_spi;
extern const struct programmer_entry programmer_dediprog;
extern const struct programmer_entry programmer_developerbox;
extern const struct programmer_entry programmer_digilent_spi;